Forward-viewing catheters and scopes for diagnosing disease and guiding interventions in small ducts (less than 3 mm diameter) require wide-field high-quality imaging since scope tip bending is difficult and ineffective. A high-fidelity electromechanically coupled finite element (FE) model of a piezoelectric actuated resonant fiber scanner is presented, which enables improvement on the general design of fiber-optic scanner geometry to increase scan frequency and field of view (FOV). Using the proposed model, parametric sweeps on the specific design variables achieved by acid etching of glass fiber are analyzed to identify their effect on scanner performance and to choose improved designs. The resulting complex fiber scanner design requires development of unique microfabrication techniques. Comparison of three model simulations and their experimental testing show that our proposed coupled model has prediction error of ≤12% with respect to experimental data, while other uncoupled models have up to 39% error. The model and microfabrication techniques presented in this paper have significance for fiber scanning-based systems in that they demonstrate reliability for model-driven design and also flexibility for fiber scanner design of complex geometries, allowing for improvement on medical imaging performance.
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December 2018
Research-Article
Electromechanical Model-Based Design and Testing of Fiber Scanners for Endoscopy
Abhijith Rajiv,
Abhijith Rajiv
Human Photonics Laboratory,
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: abhijith@uw.edu
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: abhijith@uw.edu
Search for other works by this author on:
Yaxuan Zhou,
Yaxuan Zhou
Human Photonics Laboratory,
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: yaxuanzh@uw.edu
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: yaxuanzh@uw.edu
Search for other works by this author on:
Jeremy Ridge,
Jeremy Ridge
Human Photonics Laboratory,
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
Search for other works by this author on:
Per G. Reinhall,
Per G. Reinhall
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
University of Washington,
Seattle, WA 98195
Search for other works by this author on:
Eric J. Seibel
Eric J. Seibel
Human Photonics Laboratory,
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: eseibel@uw.edu
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: eseibel@uw.edu
Search for other works by this author on:
Abhijith Rajiv
Human Photonics Laboratory,
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: abhijith@uw.edu
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: abhijith@uw.edu
Yaxuan Zhou
Human Photonics Laboratory,
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: yaxuanzh@uw.edu
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: yaxuanzh@uw.edu
Jeremy Ridge
Human Photonics Laboratory,
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
Department of Electrical Engineering,
University of Washington,
Seattle, WA 98195
Per G. Reinhall
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
University of Washington,
Seattle, WA 98195
Eric J. Seibel
Human Photonics Laboratory,
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: eseibel@uw.edu
Department of Mechanical Engineering,
University of Washington,
Seattle, WA 98195
e-mail: eseibel@uw.edu
Manuscript received January 17, 2018; final manuscript received May 3, 2018; published online September 21, 2018. Assoc. Editor: Yaling Liu.
J. Med. Devices. Dec 2018, 12(4): 041003 (8 pages)
Published Online: September 21, 2018
Article history
Received:
January 17, 2018
Revised:
May 3, 2018
Citation
Rajiv, A., Zhou, Y., Ridge, J., Reinhall, P. G., and Seibel, E. J. (September 21, 2018). "Electromechanical Model-Based Design and Testing of Fiber Scanners for Endoscopy." ASME. J. Med. Devices. December 2018; 12(4): 041003. https://doi.org/10.1115/1.4040271
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